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Illusion - Is Seeing Really Believing?
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Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
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00270_Text_ref13t.txt
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1997-02-04
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ATTENTION When we first
encounter a member of a class
with which we are relatively
unfamiliar, l believe that we
attend to those global
properties that distinguish it
from other classes of objects:
for the infant, a face as against
all other things; for the adult,
one twin face as against all
other faces; and so forth. We
"describe" only those
characteristics to which we
attend. That, in turn, means
that the memory trace left
behind contains no more
specificity than did the global
percept.
In our laboratory, my
colleagues and I have done an
experiment on form perception
that demonstrates this
hypothesized failure to
perceive all the subtle nuances
in a complex figure. The
subjects saw such a figure for a
brief period. Shortly thereafter
they took a test consisting of
two or more figures, one of
which was the same as the one
just seen. The others were
similar globally but differed in
specifics. Our subjects did no
better than chance in selecting
the correct alternative among
the shapes illustrated. Yet,
when they were given an easier
test in which none of the
wrong alternatives was of the
same overall shape as the
original, the subjects had no
difficulty in selecting the right
one. Thus, it is dear that the
global character of the shape
was perceived and encoded into
memory, but the details of it
were not.